Exercise bike



FIG. 1 is a left side perspective view of an exercise bike, showing mynew design;

FIG. 2 is a perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a back view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a top view thereof; and,

FIG. 8 is a bottom view thereof.

The broken lines in the figures illustrate the portions of the designthat form no part of the claimed design.

CLAIM The ornamental design for an exercise bike, as shown anddescribed.